To slow the growth of bacteria, milk must be chilled to 38 degrees within a few hours of leaving the cow, according to Spears.

Diesel generators are used to chill milk by communities and dairy farmers in developing countries. However, these generators are not eco-friendly as it run on fossil fuels and pollute the environment.

How does this solar powered chiller work?

The chillers pull in energy via solar panels, which gradually freezes a tank of water.

As the ice thaws, the cold water flows through tubes in the chiller, cooling the tank of milk. Also, the ice battery method chills milk faster than a conventional refrigerator.

As per The Frederick News Post, the present solar-powered milk chiller model can chill 600 liters of milk a day, but Richardson and Spears are working on models that can chill 2,500 and 5,000 liters per day using power from grid connection.

In past, Nestle bought their first two solar-powered chillers, which are currently being used in Kenya. “They’ve pretty much been working flawlessly,” Spears said. (Source: The Frederick News Post)